Saw.



D. R. NELSON.

SAW.

APPLIOATION FILED 11111.16, 1913.

Patented Dec. 9, 1913.

FIE:- E

Mme/13o COLUMBIA PLANOGRAPH CO.,WAS)IINGTON. l). c.

DANIEL R. NELSON, OF REDLAN'DS, CALIFORNIA.

SAW.

Specification of Letters Patent.

Patented Dec. 9, 1913.

Application filed January 16, 1913. Serial No. 742,507.

To all whom it may concern:

Be it known that I, DANIEL R. NELsoN, a citizen of the United States, residing at Itedlands, in the and State of California, have invented certain new and useful Improvements in Saws; and I do declare the following to be a full, clear, andeXact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in saws and particularly to keyhole or circular saws.

One object of the invention is to provide a saw of this character having means where-by after one out has been made, other cuts at right angles thereto and joining the same may be started so that the cut may be continued by the saw in this direction, thus obviating the necessity of boring a hole in making cuts at right angles to each other.

Another object is to provide a saw of this character having a right angularly disposed supplemental cutting blade adapted to be detachably secured thereto.

With these and other objects in view, the invention consists of certain novel features of construction, and the combination and arrangement of parts as will be more fully described and claimed.

In the accompanying drawings: Figure 1 is a perspective view of my improved saw; Fig. 2 is a side view thereof looking toward the same side as that shown in Fig. 1; Fig. 3 is a cross sectional view of the main and supplemental blades of the saw taken on the line 3-3 of Fig. 2; Fig. 4 is a similar view taken on the line 4-lof Fig. 2; Fig. 5 is a detail plan view of the supplemental cutting blade of the saw; Fig. 6 is a detail side view of a portion of the main saw blade with the supplemental blade removed; Fig. 7 is a detail perspective view of the catch for fastening the inner end of the supplemental saw blade to the main blade of the saw; Fig. 8 is a perspective view of a modified form of the saw; Fig. 9 is a cross sectional view thereof taken on the line 99 of Fig. 8.

Referring more particularly to the first seven figures of the drawing, 1 denotes the blade of the form of my improved saw shown in these figures, said blade being narcounty of San Bernardino her 5 of the supplemental row and tapered from its inner toward its outer end in the same manner as the usual form of keyhole saw blade is constructed. The blade 1 is secured to a handle 2 in any suitable manner.

In the upper edge of the saw blade 1 at a suitable distance from its inner end is formed a notch 3, said notch being arranged at an angle to the blade as shown. Formed in the blade 1 near its upper edge and at a suitable distance from the notch 3 between the latter and the handle is a transverse aperture 4- with which is engaged a supplemental blade locking member or catch 5 hereinafter described. Also arranged on one side of the blade adjacent to its inner end is a spring clip 6 which is preferably cut or struck from the blade and bent upwardly as clearly shown in Figs. 2 and 4 of the drawings.

Secured to the main blade 1 near the inner end thereof is a supplemental saw blade 7 which projects laterally at right angles to the main blade 1 and is disposed adjacent to or in line with the upper edge of the main blade as shown. The blade 7 is con1para tively short and has its toothed outer edge tapered from the rear or inner end thereof to the point or front end as shown. On the inner edge of the supplemental blade which engages the side of the main blade and near the point of the supplemental blade is formed a locking lug 8. The lug 8 is disposed at an angle to the edge of the blade 7 corresponding to the angle of the notch 23 in the upper edge of the main blade with which the lug 8 is engaged when the supplemental saw blade is arranged in position on the main saw blade. In the supplemental saw blade 7 near its inner end is formed a transversely disposed elongated aperture 9 with which when the supplemental saw blade is in place on the main blade is adapted to be engaged the hook shaped extremity 10 of the right angular outer end 11 of the catch or looking memsaw blade, said right angular end 11 of the catch having a loose pivotal engagement with the aperture 4 in the main saw blade. The catch 5 is provided with a shank 12 which extends rearwardly from the right angular end 11 of the catch and is adapted to be sprung into engagement with the clip 6 formed on the main saw blade as hereinbefore described and which secures the catch in position for clamping and holding the supplemental blade 7 in operative engagement with the main blade 1 of the saw.

In Figs. 8 and 9 of the drawings is shown a modified construction and arrangement of my improved saw which in this instance comprises a main blade 13 on the lower toothed edge of which near the inner end thereof is arranged the supplemental saw blade 14% the construction of which is similar to the supplemental saw blade 7 shown in the first figures of the drawings except that the blade let in this instance is, formed integral with the main blade 13 and is arranged at the lower edge instead of at the upper edge thereof.

In using my improved saw for cutting a rectangular hole in a board, a hole is bored through the latter at a suitable. position at the corner of or on one of the lines of the opening to be cut and the main blade of the saw engaged with the bored hole and a cut made along one side or along one of the lines of the hole. lVhen the end of the line or opposite corner of the openings. has been reached the main blade of the saw is pushed through the cut just formed until the supplemental saw blade comes into engagement with the board and the saw reciprocated to cause said supplemental blade to start a cut at right angles to and at this end of the cut just completed by the main saw blade. After the right angular out has been thus started by the supplemental blade, the main blade is withdrawn from the first cut and engaged with the started second out which is then completed by the main blade and at the end of this second cut the next cut may be started at right ang'es thereto by the engagement of the supplemental blade of the saw with the board in the manner described. By this operation it will be seen that the cut may be continued or a series of cuts formed at right angles to each other until the starting point of the opening has been reached, thus forming a rectangular opening'without boring a hole at each corner thereof as is necessary in forming an opening of this shape with keyhole saws now in use. It will also be noted that if the cuts formed by the main blade are true that the opening Wlll. have absolutely square corners 01'? 5 When a rectangular be formed inwardly the same may be i cut with my improved saw with-out boring will be rectangulan notch or recess is to from the edge of a board any holes for starting the saw, as will be readily understood.

From the foregoing description taken in connection with the accompanying drawings, the construction and operation of the invention will be readily understood Without requiring a more extended explanation.

Various changes in the form, proportion and the minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of the invention as claimed.

Having thus described my invention, what I claim is:

1. A saw of the character described comprising a main blade having in its upper edge a notch and having therethrough a transverse passage, a supplemental saw blade having therein near its inner end a transverse aperture, a locking lug formed on the inner edge of said supplemental blade and adapted to be engaged with the notch in the main blade, a catch engaged with the apertures in said main and supplemental blades whereby the latter is secured in operative engagement with the main blade, and means whereby said catch is held in position to fasten the supplemental blade to the main blade.

2-. A saw of the character described com prising a main blade having in its upper edge a notch and having therethrough a transverse passage, a supplemental saw blade having therein near its inner end a transverse aperture, a locking lug formed on the inner edge of said supplemental blade and adapted to be engaged with the notch in the main blade, a catch comprising a shank having a right angular end adapted to be engaged with the. aperture in said main saw blade, a hook-shaped extremity on said an gular end adapted to be engaged with the aperture in said supplemental blade whereby when said shank is sprung into engage ment with the main blade,v said supplemental blade will be fastened in operative position on the main blade and a spring catch on said main blade to receive said shank and hold said catch in operative position for fastening the supplemental blade to the main blade.

In testimony whereof I have hereunto set my hand in presence of two subscribing witl nesses.

DANIEL 1%., NELSON.

'Witnesses:

CHARLES A. Rocenns, Ci-rAs. E. TRUESDELL.

Copies of this patent may be obtained for five cents; each, by addressing the Commissioner of Patents,

' Washington, I) C. 

